feat(graph): add plantuml output format

[jongio]

What

Adds plantuml as an output format for azd app graph.

azd app graph --output plantuml emits a PlantUML component diagram you can paste into docs or render with any PlantUML tool.

Why

The command already produces Mermaid and Graphviz DOT. PlantUML is a common choice for architecture docs and is supported by many wikis and IDE plugins. This adds it alongside the existing diagram formats without changing any of them.

Details

• New plantuml value for --output (-o).
• Output is wrapped in @startuml / @enduml.
• Services render as component, resources render as database, so the two are easy to tell apart.
• Dependency edges use --> with sanitized aliases, reusing the same alias generator as the Mermaid renderer.
• A title line is emitted from the project name and omitted when the project is empty.
• Works with --output-file and --focus, same as the other formats.

Tests

• TestRenderGraphPlantUML, TestRenderGraphPlantUMLNoProject, and TestEscapePlantUMLLabel cover the rendered structure, the empty-project case, and label escaping.
• go build ./..., the commands package tests, and golangci-lint all pass.

Closes #525

[github-actions]

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[codecov]

Codecov Report

❌ Patch coverage is 89.18919% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.79%. Comparing base (37e07e7) to head (e8b8af9).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cli/src/cmd/app/commands/graph.go	89.18%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #528      +/-   ##
==========================================
+ Coverage   60.77%   60.79%   +0.02%     
==========================================
  Files         223      223              
  Lines       28527    28559      +32     
==========================================
+ Hits        17337    17363      +26     
- Misses      10010    10015       +5     
- Partials     1180     1181       +1     

Flag	Coverage Δ
unittests	60.79% <89.18%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
cli/src/cmd/app/commands/graph.go	85.54% <89.18%> (+0.20%)	⬆️

... and 1 file with indirect coverage changes

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[github-actions]

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Build Info:

• Version: 0.19.5-pr528
• Commit: e8b8af9
• Release: View pre-release

What to Test:
Please review the PR description and test the changes described there.